Tapping-machine.



A. W. CASH.

TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

, 1 094 125 Patented Apr. 28, 1914.

3 SHEETS SHEET 1.

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5] w ueuto'o Mid/M1 141 [aka/ a Patented Apr. 28, 1914.

3 SHEETS-SHEET 2.

A. W. CASH.

TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

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TAPPING MACHINE.

APPLICATION FILED SEPT. 19, 1913.

Patented Apr. 28, 1914.

3 SHEETS-SHEET 3.

.the fluid 'pre ssure'iiptlie main, a source of of the branch pipe tothe outlet of the valve.

citizen of the United States, residing at "the excavationafterbeingapplied. to the main, 'and; means for feeding the cutter -mainwithiuthe excavation while the mahas the advantage of shorteningthe-distance .uNrrE STATES P TENT OFFICE.

ART UR w. CASH, or DECATUR, nmnois, ASSIGNQR to H. Mommas MFG. 00., orDaemon,- ILLINOIS, A CORPORATION or rumors".

To all whom it may concern: 1 M -Be it known that I, Airmen W; GAsi'i, a

Decatur, in the county of Macon and State of llli ois, have invented newand useful. Improvements in Tapping.- Ma-chines, of which the followingis a specification.

This inventionhas reference-to improvements in tapping machines-21mlmore particularlyto that class of machines-which are used for cuttinginto, and-making branch or other connections with pipes or mains 'un1(ler'fiuid pressure. The presentii'fi/ention i's-particularlyapplicabletotapping" machines whereby the main may be cut into and theconnectionforined Without the necessity of'shutting oif muchiamioyanceand inconvenience to resi-, dents iiithe vicinityfivhereythe cuttingopei-ationsearejbeihgi-carried oil-because of a more "or. lessprolonged} deprivation of, the gas or water-supplygs the case may be.,,An -object offthisffinvention is to provide means whereby-the machinemay be either inanually orpower driven from, the top ofautomatically ata constant rate of'advanceinto workingcontact with the main during thepi'ogress'of the boring operation, inak ing itunnecessary for anattendant to grechine is working. .-:A' further object is to providemeans forquickly; applying the cutter to {the main prior to starting themachinei'nto operation. A'further object is; the provision of improvedmeans whereby, the piece of pipe cut from the min by the action of thecutter is arded against falling into the main.

nother objectis toprovide an improved construction'bf valve for shuttingofi: the flow 'oflfiuid after the, openin' has been-cut in the main, andprevious to e removal of the cutting mechanism a'nd the connection Thisimprovement consists informing the means foisecuring the-.valve-tothe-.main and th valve body inf'one-piece thereby avoiding thenecessity; of an extra joint between the valve body and said;meansjwhich Tlirr'mG-mionmn.

- Specification of Letters Patent.

lipnlication tiled September 19, 1913.

to the outer face ofthe' valve, resulting in a similar shortening of theshaft'of the out Serial no. 790,672.

ting mechanism-and the distance which it Patented Am-(28,1914. I

has to travel prior to reaching'i' its cutting position on the main. Afurther advantage of forming the valve body securing means integrally isthat the inlet to the bodyadja- .ccnt'the main may be machined uniformlyconcentric with the bore of the outer flange of tlie-valve whereby aguide or hearing is provided for the cutter carried on the end ofthevshaftof the cutting mechanism, so

that said cutter may be started in' unifornil v correct position andwithout vibration usu-.

ally caused by commencing the cuttingop eration on the curved or'unevcnsurface of the main. It will bealso noted that the bearings thus formedguard the cutteragainst side-wise shifting movement-so that. rchminarypiercing of the walls of the niain by pilot drills is avoided therebyef-m fecting a saving of much time and labor usually spent with thispurpose in view and accomplishing aconsequent reduction in the;

tion.- v I A further object is to assemble the workingparts of themachine in. compact form,

permitting its operation in excavations,

smaller than have been required previously inmachine's of this type sothat a reduction in the size of the excavation is obtained and aconsequent reduction in the exp ense.' In addition the use of themachine on mains in expense of carrying on the tapping opera-.

close proximity to building Walls or other obstructions is madepossible, a use not possihle in. machines of less compact construction.

A further object is to provide an gouter casing entirely inclosing alldriving inechanism of the machine, thereby preventing gdirt and gritfrom-falling into the machine, a condition causing excessive friction.with a resultantincrease in power necessaryffor the operation of themachine, as Well as a rapid wearing away and destruction of the drivingmechanism. 1 With these and other ob ects in view, the

invention consists in the novel construction a and combination of partshereinafter more fully described lll' tl preferred form, reference nowbeing made to the accompanying drawings :inwhich,-- I 'Figure ,1 is-x'anelevation ,o f'the tapping IniLClllHQCOHHeCiQd to the main; Fig.- 2- isa lo. gitudinal section of the cutting mechanism. Fig.- 3 is adetaillongitudinal section teeth will thread r "ing mechanism.

'5 ofthe cutter head showing means for pre 'enting the cut-out portionfrom falling.

Into the main. Fig. 6 is a transversesection on'the line 6-6 of F ig: 2lookingin the direction of the a'rrow.

Similar (haractersof reference. refer to' similar parts throughout the:severalviews- In the drawings 20 'is the; casing of-the cuttingmechanism; formed of two:. hollow cylinders 21 and 22. open,at:each endand connected-totheirinner and outer extreini ties; respectively; totheworm gear case 2; bly'any suitable means. A screw. cap 24:. closes touter extremity of ,thecylinder a partof the ca sing 20 has an inwardlycuriedportio'n 25, j terniinat-ingdn a.h0llow neck-26 which formson itslIIIIOL Cll'CUIllfQL" ence 'a'hear'ingfin which rotates thelcntte'rshaft27'. The outer circinnferenceof the neck- 26 forms 'a rigid' shaft onwhich rotates the'h'ub29pf the worinIg'ear 28. Coupled to the -in'nerextremity of the easing 20 is 'a.- base platBO having asiinilarlyinwardly curved portion 31 'fashioned to form a bearing 32 forthe innereiid'of th cutter shaft 27. To provide a'fiuid tight jointaround theshaft 27'a'nd kc'ep the fluid pressnre from entering" thecylinders 21 nu-1'22 a gland 4 cap is positioned over and slightly above35 thebcar'ing 32,*an'd 'fastened to the base plateby ineansofadjustable studs 31-. At somerpoint'nearthe inner end of the shaft .27is ai-sere-w threaded opening 35'f r the reception of a set screw '36which securesthe cutter-hub 3'? 'on the shaft. The outer extremity ofthe cutter huh'is fashioned to form anannular recess 38 serew-threadedto .mesh. wit-Ira similar screw threaded 'mi-tion on theinnercircumfereuetirof the cylindrical Gunman. The shaft 27 being hollow:l'rmn'end to end a center combined drill and tap 40' may be insertedin; the lopeninght the lo vermzid of the shaft iii which case the shankof the renterdrill provided with a seat all for-the I'CPCPtlfill oftheset sci-(v36 which secures the drill on thesha'ltg, A pluf, 4-2 isexpanded tightly into the hollow shaft 27 to prerentlthe fluid underpressure from entering the rear part of the=shaft. if desired the centerdrill and tapddnnq he dispensed,with its" only funetiim beingto pierceand hold theeirrnla r piece out from f t e main againstfalling\rithin'themain. In this case the cylindrical cutter is providedon itsinner circumference with thread cutting teeth see Fig. 5, of. the samelead or pitch as the feeding screw; .44, thereasonfor which will behereinafter, described. As the boringoperation is being carried onthethe circular pieie 'cut 2:2, forming M from the main and Fig 5-isadetail view 1e open outer end.-of'the easing20.. The

gear-d it against talling intothe main, preventi'ng a stoppage of thepipe.

Th'elshaft 27 is driven by the worm-gear 2S fastened "thereon bysuitable lgeys 45 Meshed-witn the face of' the wormgear 28 IS a wor1n46on a. shaft 47jouri1aled in suitable bearings 4SQformed by an extensionof the gear case 23. The shaft; Finlay-be rotated either by a hand;lever coupled directlythereon, but it isfpreferablelt-o .;1'o-' tate theshaft byineans of a flexible jointed shaft 49 which extends 'lo the topof the leX- eavation, thereby reru'lerjing it unnecessary for anattendant to ren1'ain within'the lexeiiration duringthe operation ofthema.- cnne. i At its outer esti 'emity the sl1aft 2iiibuts; the hub 50of the internal'g'ear 51.1Tliis hub is screw threaded to mesh with screwwhich-rotates in aecntral ope ning 5:3 in the cylinder cap 2% andisprgwiddfat its outer end with a hand "crank 54: Aston L pin 55 engagesthe crank 54 and preyen'ts the feed screw-fromrotating when the 'cut- .9ter has been brought into"contactwith ithe outer-surface of'them'a-in."1 5:

A series vo t gear teeth 56 the shaft- 27' mesh" witlfand' rv 57 keyedon one end ofiftheboinit journaled in suitable bearings'iirthe-housing5.); On the other end ofthe lt'i't'SS is' 'al" drive pinion G0meshingwitlr-tlie teethon the internal gear 51 :mdcaushig:itto mine i in'a direction 'opposite to the shaft, 97. The 190 housing-1'19 encircles.the. endof'the-shziftQT and seats at its lower end in an'ilngulai'reeessin thesaid shaft and a like recess-in .the hub of the.inte'rnahgear 51filiut'isflii-og euled from rotating therewith bynnansm5 of the spline slidcTway 61 fastened inthe 7: easing 21 theeutireset O'E'Q'Ctll nnd the housing being capable of longitudinalhnn'e mentonthe slideqvay 61, when ,eithrr the shaft 27 or the screw -14 isrevolved;

The valve 62 consists of t "portion 63 and the. sleere'portion' (34which forms a part of the means foiflsecuriujx the-f yalve aroundthemain. Aeleeve section similar to the sleeve portion of-llie'ralve'1'15' G2; is assembled on thcoi he main body )posite side of the9 strips '66 and (flare interposed between the two sleeve sections andmachine bolts 68 and Formed in' *thedower, sleeve section 135, aregtooves'TO and 71 in which set tongues 7:; and 73 on the; packingstrips. the tongues being somewhat deeper than the grooves so of thegroove beforethe sleeve faces'meet and are crushed when themachine bolts68 and 69 are'tightened, thereby renderingthe joint between'the twosleeve sections impervious l'OJ -fillld. The valve. proper inny 13 0 ersha ft 58 2 5' rrm'm, andsuitahle rubber or leadr'paeking G9 couple thetwo sections. around the -1n'ain.-

"that they come into contact with thebottonr head of the gate 74,operated by any suitable] messes be of any desired construction but the?present instance is of the reciprocating-f type, having a gate 74 whichshuts ofifthe' flow of water from the opening" in tlie main, and a screwthreaded steni-TFmesh ing with a screw threaded portion in the' means toopen and close' the jvalveI.

The sle'eve section'G-t and the"valv'e body" (33 being integrah thethroat or inlet "76 to the valve adjacent the -rnain may bema chineduniformly concentric with the bore 77 of the outer flange of the valveto which the machine is connected, thereby providing a guide orbearingforthehollow cylindrical' cutter carried'on the outer end of themachine shaft. Eucompassing the 'valve inlet 7G and adjacent the main isan annular recess or groove 79 wWlllClJ receives andre-I' talns a. ringor strip 80 of "resilientsor expansiblematerial whereby to form an'iim-lpervious outer surface of the 'mam.

' Another feature of this inventionus-tllej semi-circular formation oftheepacltingire oint between the valve body and.

grcov'e'i't) whereby to retain thepackingQO,

in the coupling member 64.

Ieretotorehas been the cnston-ijtoplace member of this c racterupon'thc-nnain and to then pour in the lead or otheranate'rialconstituting the packing ring, "but";-;th1,'s-'

method has been founthvery unsatisfactory since the operatortappingthe'main cannot tell whether or not the ring'has been-cast infull. To overcome this difficulty applicant provides a pair ofcastingsmcmbers 81 and 82, F l

and ,9, which are-placed a gainst the opposite sides of the member (i l,

preferably at the-factory where the-machines are manufactured, and whichwhen' asseu-ibled, as shown in Fig; 8,- constitute a mold for receivingand holding the poured metal in the groove 79 until the metal isset. Themember 81 bonforms to the inner cum-a? ture of the member andbearsagainst the inner side of the groove 79, the member 81 being slightlyreduced in diameter as compared with the diameter of the opening throughthe member fat, whereby the cast ring is constructed at its lower sideso as to provide for a tight fittmgfconnection between the memberifi andthe mair.. The

place by reason of the s nii-.circular formaion of the groove 79. T eccured by any suit-V means to the outer flange 78' is an a'dapt'erfiange Stf'which'is in turn fastened casing-"20 o the cutting mechanism.

In operationfthevalve body63 and sleeve part 64,-which carries the'castpacking ring 80;is placed-on the-main to beta-pp'ed or cut. into andtheother half '65 ofthe sleeve is assembled on'the' opposite sideofthemain, the packing strips 66' and {37' placed between the two sleevesections with the tongues 72 and 73in the grooves'i'O and 71respectively, and the machine bolts (38 and 69 tightened to bind thesleeve sections about the main to thus render the joint between thesleeve sections impervious to wateri; Shonld lead packings be usedinstead'of the rubber paekings (3(3 and 67 all joints should be calkedbefore the machine is bolted to theralve. The valve body (33 having.been thus attached to the main, the cutter 39 is secured to the hub3i"and the latterimounted on the end of a, sha ft- 22.] 'Thejcuttiiigmechanism is now ready for; mounting ion the valve. preparatory tocutting into the -main. .The cutting mechanism isnow'securedto the.valve (33 by means ofthe adapter fia-nge 84, machine bolts being{usually einpmyedfifor this purpose, although any suitable securingmeans may be substivtutedt-'lhetapplng machineis now in position for'operationupon the main. This ha v- "ing been-done, the stop pin 55 ispushed out. ofithe path .of the' 'c'mnlchandle 54-v 'and the 'saidcrankhandle is rotated thereby rotating the: feed screw 44: without causingthe gears -to rotatewhich causes the shaft 27 with the gearson its upperextremity, to more -l.or- Wardly until the cutter 39 comes into contactwith the outer Slr'ifilcfl of the main- Then. the stoppin 55 is pulledout into the path of 'the crank handle 54; stopping the rotation of thelatter which causes the shaft 27 and the cutter 39 to automatically feedforward as the shaft is driven bythe worm gear 2% and the worm 46; Thisaulxmiatic forward feed is accomplished by means of the gears journaledin the gear case 53'). 'As the shaft 27 is being rotated by the worm23,-1110 pinion 57" which meshes with the teeth 56 formed on the upperend of the said shaft will be caused to rotate in a direction oppositeto theshafti The drive pinion i0 on the other end df-..th'e countershaft 58 meshes with the teeth on the internal gear 51 causto thedirection of rotation of the shaft 27 forwardly on the feed screw 4% asthe cutting operationjs being carried on, it will be smaller diameterthan the shaft 27 will cause the screw threaded hub of the internal gear50 to revol \.'c about the feed screw ll at a less rapid rate than thatat which the shaft t fthebase )late 30 on-the lower end of the in g thesame to rotate. in a direction opposite 0 thereby causing the cuttershaft to be fed noted that the gears 5,7 and (30 being of a and cutterare revolving thereby causing the 1 theilatter upon therota'tionof theshaft, an

cutter to advance sat-each" revolutio h .an 1 amount considerably lessthan thejpitch -of the screw threads on the feed screw. In thisconnection, however, itwill be-necessaryijto regulate the pitch of thethread-cutting teeth:

'43 on "the cutter; 39 for thethreads on the combined drill and tap 40so that they will advance at the same rate as the, shaft, It

will be observed that by using the reducing gears the necessity ofthreading the screw to a very finevpitch on the feed screw 44 isavoided, 1

What I claim is 1. In a machine for tapping mains, a cas-. I

ing, a shaft rotating in the casing, a feed screw. revolubly mounted inthe outer end of the casing, a locking deviceforthefeed screwto hold thesame from turning, a gearingmcmherthreaded to the feed screw and hav ingconnection withthe' shaft for-advancin a key mounted longitudinally inthe "casing and-engaging said member to hold the same.

. from turningavitli the shaft whereby 'th'e shaft is automaticallyiedby its rotation,

said key beingfof 'a'lefngth equalt'othe dis-= tance of travel of'thesliaftfwherebyjsaid: feeding" means" is held irmh aiming 'throughj-\ outtheentire length of-1noi-'en1ent o'iithe 2. In: a machine-for tappingiriiiin's',- a-ca's m g, a feed-screw adapted to ,be, held statiom ary nthecaslng, atra nof gears carrled'on" the shaft and engaging sa dfeed;serew'and adapted to he turned by the shaft, and a ke'fi'inthecasing engaging said gears to hold the" sm gma turning about theaxis of the shaft whereby said shaft is ea by its' ro tation, saidkeyextending' longitudinally Withahout thes h aft throughout the I entire'lfitgth ofitravel of the g; 3. In a device. for tapping-mains, thecomhination with' al; shaftgofa butter on the end: of said-shaft, meansv:Eor rot'ating said-shaft,

a feed screwextending'into the shaft, a ro-"' tary member threaded onthe feed screw andhaving connectioh with the shaft for advancingthesanie' when turned, acrank handle .on

the outer endofthefieed screw for'manually advancing theshaft, and meansfor holding the crank handle, against revolution upon the operation ofsaid rotating means.

4. In a device of the character described, a casing, ashaft in's'aidcasing, means for rotating the-shaft,- a cutter on one end of theshafta" feed screw mounted in'the'casing and projecting into theopposite end of the shaft, an internal'gear having a hub thread eduponsaid feed screw, a gear fixed upon said shaft,;ayframe mounted forrotation uponfthe shaft about :said .-"gear; a counter. shaft mounted-insaid frame, gears upon the oppositeends of gthe countersl'1aft*respecativelyknga'gin said internal 'ga r and said .{gear whther-shaft; and an elongated .key 'Iriounted in the' casinglongitudinally. of the ishaffiimdfenga'ging said frame to hold the tiono'f'said shaftj internal gear rotates qmtheitfeed'iscrewwto advance saidshaft in 1tlie ,a's n'g; "In -te st im oiiy whereof I-have hereunto set.111)? h'andiilzpresen'cbf two subscribing wit LiutTH R w; dis

I Eff Witnesses:

n iee i sa'e'he-eb ihe g a ar 1 61

